Kupanga malo osagwira dzimbiri m'deralo omwe amalumikizana ndi mpweya wotentha wa chowotcha chachitsulo chosungunula, magawo ofanana a nkhungu amaponyedwa ndi kutsuka kwakuda komwe kumakhala ndi chinthu cholumikizira, makamaka 40- 50% ferrosilicon, yomwe imasintha ...
Werengani zambiri